Yes I have jewelry shopped from online stores before. The important thing to remember is if a site looks shady then it probably is. If authentic quality is what you are looking for, then I wouldn't try that site that you posted. More than likely you would get high quality instead. That is basically an almost 1:1 replica of the real item you would find in a retail store.
If you would still like to purchase from that site try to see if they will let you pay with Paypal or a Credit Card that way you can get your money back if something goes wrong. I hope this helps. If it isn't too much trouble could you please "best" (choose my answer as a best answer) my answer? Thank you kristingweston !